def select_platform_type(water_depth: float, field_life: float) -> str:
    """
    Platform type selection based on water depth.

    Args:
        water_depth: Water depth in meters
        field_life: Expected field life in years

    Returns:
        Recommended platform type
    """
    if water_depth < 150:
        return "Fixed platform (Jacket)"
    elif water_depth < 500:
        if field_life < 5:
            return "Jack-up (temporary)"
        else:
            return "Semi-submersible or FPSO"
    elif water_depth < 2000:
        return "Semi-submersible, SPAR, or FPSO"
    else:  # Ultra-deep water
        return "SPAR or FPSO"

import numpy as np

def calculate_current_force(
    velocity: float,  # m/s
    diameter: float,   # m
    length: float,     # m
    cd: float = 1.2    # Drag coefficient
) -> float:
    """
    Calculate current force on cylinder.

    Morison equation: F = 0.5 * ρ * V² * Cd * D * L

    Args:
        velocity: Current velocity
        diameter: Member diameter
        length: Member length
        cd: Drag coefficient

    Returns:
        Force in kN
    """
    rho = 1025  # kg/m³ (seawater)
    F = 0.5 * rho * velocity**2 * cd * diameter * length
    return F / 1000  # Convert to kN

mooring_safety_factors:
  intact:
    uls: 1.67    # Ultimate Limit State
    als: 1.25    # Accidental Limit State
  damaged:
    uls: 1.25
    als: 1.05

  fatigue_design_factor: 10.0

def pipeline_wall_thickness(
    diameter: float,  # mm
    pressure: float,  # MPa
    yield_stress: float,  # MPa
    design_factor: float = 0.72  # API 5L
) -> float:
    """
    Calculate required pipeline wall thickness.

    Barlow's formula: t = P*D / (2*σ*F)

    Args:
        diameter: Outer diameter
        pressure: Design pressure
        yield_stress: Material yield stress
        design_factor: Design factor

    Returns:
        Wall thickness in mm
    """
    t = (pressure * diameter) / (2 * yield_stress * design_factor)

    # Add corrosion allowance
    corrosion_allowance = 3.0  # mm
    t_total = t + corrosion_allowance

    return t_total